ElastiStack is a little script that let's you navigate through a stack of items by dragging away the first one.

It comes with an elastic touch meaning that when dragging the top-most item, the other ones will follow as if they were connected elastically. When reaching a certain distance, the dragged item will release itself and the next item will pop out.

Dropzone.js is a light weight JavaScript library for jQuery that turns an HTML element into a dropzone. This means that a user can drag and drop a file onto it, and the file gets uploaded to the server via AJAX. It supports image previews and shows nice progress bars.